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Copy of CPO Electrical Power (6/7/2024)

Last updated almost 2 years ago

20 questions

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Question 20

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You use a 1200 watt hair dryer for 10 minutes each day.  How many minutes do you use the hair dryer in a month.  (30 day month)

30 minutes

300 minutes

15 minutes

40 minutes

How many hours do you use the hair dryer in a month? 

5 hours

3 hours

30 hours

40 hours

What is the power of the hairdryer in kilowatts?

3 kW

1.2 kW

10 kW

1.8 kW

How many kilo-watt hours of electricitydoes the haidryer use in a month?

4 kWh

5 kWh

6 kWh

7 kWh

If your town charges $0.15 per kWh, what is the cost to use the hair dryer for a month?

$0.90

$0.80

$1. 10

$1.20

Your alarm clock is connected to a 120 volt circuit and draws 0.5 A of current.

30 w

40 w

50 w

60 w

Convert the power to kilowatts.

6 kW

0.06 kW

0.2 kW

10kW

Calculate the number of kilowatt hours of electricity used by the alarm clock if it is left on for a year. (365 days)

870 kWh

670 kWh

525.6 kWh

8 kWh

Calculate the cost of using the alarm clock for one year if your town charges $0.15 per kWh?

$78.84

$34.50

$12.90

$68.12

A toaster is plugged into a 120 volt household circuit.  It draws 5 amps of current. What is the resistance of the toaster?

24 ohms

6 ohms

7.3 ohms

60 ohms

What is the power of the toaster in watts?

5 watts

24 watts

120 watts

600 w

What is the power in kilowatts

0.5 kW

0.6 kW

60 kW

12 kW

A circuit contains a 12 volt battery and two 3 ohm bulbs ind series.  Calculate the total resistance of the circuit

6 ohms

8 ohms

3 ohms

1 ohms

Calculate the current in the circuit.

9 A

12 A

2 A

6 V

Calculate the power of each bulb. 

12 watts

2 watts

20 watts

28 watts

Calculate the power supplied by the battery

2 watts

10 watts

12 watts

24 watts

A circuit contains a 12 volt battery 3 ohm bulbs in parallel.  What is the voltage across each branch

3 v

6 v

12 v

24 v

Calculate the current in each branch.

12 A

14 A

4 A

2A

Calculate the powerof each bulb

4 watts

12 watts

24 watts

48 watts

Calculate the total curent in the circuit

12 A

8 A

6 A

24 A